Importance

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Abstract

A size checking apparatus is employed to check sizes or dimensions of a work. The size checking apparatus includes: a constant speed transporting unit for a work; a measuring unit for continuously measuring a distance from a measurement sensor to a measuring position of the work while the work is being transported; a trigger signal generator for sensing that the work has passed and for commencing an acquisition of a measurement value by the measuring unit in response to a trigger signal; a pulse signal generator for generating a pulse signal in synchronism with the transportation of the work; an average value holding circuit for holding, in a time sequential mode during one cycle, an average value of the measurement value; an upper limit data holding circuit for holding an upper limit value; a lower limit value data holding circuit for holding a lower limit value; a calculation processing unit for setting an allowable range and for outputting a defect signal when the measurement value deviates from the allowable range; and a connection unit for a computer for setting the quantity of works to be measured, a measuring time period and a measuring number in the calculation processing unit, for setting the allowable range and for displaying the allowable range and the waveforms of the measurement values.

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First Claim